1 files changed, 20 insertions, 0 deletions
diff --git a/toolkit/actors/UnselectedTabHoverChild.sys.mjs b/toolkit/actors/UnselectedTabHoverChild.sys.mjs
new file mode 100644
index 0000000000..1cf1ddb9fd
--- /dev/null
+++ b/toolkit/actors/UnselectedTabHoverChild.sys.mjs
@@ -0,0 +1,20 @@
+/* vim: set ts=2 sw=2 sts=2 et tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+export class UnselectedTabHoverChild extends JSWindowActorChild {
+  receiveMessage(message) {
+    Services.obs.notifyObservers(
+      this.contentWindow,
+      "unselected-tab-hover",
+      message.data.hovered
+    );
+  }
+
+  handleEvent(event) {
+    this.sendAsyncMessage("UnselectedTabHover:Toggle", {
+      enable: event.type == "UnselectedTabHover:Enable",
+    });
+  }
+}